KR100450531B1 - Matrix of Engine Hood for automobile and preparation thereof - Google Patents

Abstract

The present invention relates to a molding material for an engine hood of a vehicle and a method for manufacturing the same, wherein the molding material is composed of a nonwoven fabric laminated on one surface of a web laminate, and the nonwoven fabric is formed of a low melting point polyester binder fiber and a general polyester matrix. The web laminate is composed of a high melting point polyester binder fiber and a general polyester matrix fiber, and the molding material exhibits excellent sound absorption and thermal insulation property, and is not only suitable for an engine hood but also a simplified process, high productivity and There is an advantage that can be manufactured at a low manufacturing cost.

Description

Engine hood molding material for automobile and its manufacturing method {Matrix of Engine Hood for automobile and preparation etc}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding material for an automobile engine hood, and more particularly, to an environmentally friendly molding material for an automotive engine hood, and a method of manufacturing the same, with the main material as the main material and having improved heat resistance and sound absorption performance.

The engine hood used in the engine room needs to absorb the noise generated from the engine room so that it does not go out and at the same time block the heat generated by the engine.

The existing molding material for the engine hood mainly uses glass wool or resin felt. The glass wool has good sound absorption, but it is harmful to the human body. In the case of resin felt, dust and odor are generated, and especially in the summer season, which is weak due to moisture, there is a problem such as mold generation and thus has a serious defect as a product.

Therefore, the present invention is to provide a molding material for a new engine hood that can solve all the problems of the prior art as described above as a technical problem.

In order to solve the above problems, the present inventors have excellent sound absorption and environmentally friendly polyester cotton used as a substrate of a conventional dash inner or a flow carpet, but the low melting point polyester is used as the binder fiber. Due to the deterioration of the heat resistance after molding, it was found to be inadequate as an engine hood molding material. Therefore, if the heat resistance of the polyester backing is improved, it can be usefully applied as an engine hood molding material. As a result of repeated experiments, the molding material is divided into two layers, and the shape and content of the binder fiber and matrix fiber used in the web laminate are different, and the shape of each layer is laminated in a different manner, which is very suitable for the engine hood. Simplified molding process, high productivity and low fabrication The present invention is completed by knowing that it can be produced horizontally.

Therefore, according to the present invention, in the engine hood molding material for automobiles, it is composed of a polyester web laminate and a nonwoven fabric laminated on one surface thereof, and the web laminate is a polyester binder fiber and polyester having a melting point of 170 to 200 ° C. An engine hood molding material for automobiles is provided which is composed of matrix fibers.

In addition, according to the present invention, as a preferred method for producing the automotive engine hood molding materials described above, a web laminate is formed by mixing and carding a polyester binder fiber having a melting point of 170 to 200 ° C. and a polyester matrix fiber to form a web and laminating it. A process of manufacturing a step, laminating a nonwoven fabric on one surface of the web laminate, a step of primary laminating the web laminate on which the nonwoven fabric is laminated by passing through a hot air oven machine and the primary laminated molding material through a cooling roller Thereafter, there is provided a method for manufacturing an engine hood molding material for an automobile, comprising a step of heating and pressing a second composite by hot pressing roller.

Hereinafter, the present invention will be described in more detail.

The engine hood molding material for automobiles of the present invention mainly consists of a polyester web laminate and a nonwoven fabric laminated on one surface thereof.

The nonwoven fabric used in the present invention is a nonwoven fabric which is preferably used to avoid the use of a separate hot melt film when laminated with web laminates. A method of carding a 100% polyester fiber composed of 60 to 90% by weight of a regular polyester matrix fiber to form a web and needle punching the same.

The nonwoven fabric is a skin material in a molding material that is a final product, and serves to improve the appearance and surface strength after molding. Since the use of expensive fine-grained fibers is not required, low-melting polyester having a fineness of 2 to 4 denier is preferable. 10 to 40% by weight of binder fibers and 60 to 90% by weight of regular polyester matrix fibers having a fineness of 6 to 15 deniers. In the case of the low-melting-point polyester binder fibers, a part of the low-melting-point polyester binder fibers is melted in a subsequent heat fusion process using a double-structured filament having a sheath / core shape in the cross section. To bond with polyester matrix fibers.

The web laminate consists of binder fibers and ordinary polyester fibers, but uses high melting point polyester binder fibers having a higher melting point than the binder fibers used in the nonwoven fabric in order to express improved heat resistance after molding. In a preferred manufacturing method, the web laminate has a high melting point polyester binder fiber having a melting point of 170 to 200 DEG C and a fineness of 2 to 4 deniers and 50 to 50% by weight of general polyester matrix fibers having a fineness of 1 to 6 deniers. 80 wt% may be carded to form a web and the resulting web may be laminated and prepared. The thickness of the nonwoven fabric is preferably 1 to 5 mm, and the nonwoven fabric is preferably molded so that the thickness of the nonwoven fabric is in the range of 2 to 25% of the thickness of the molding substrate. Since the web laminate is a factor that determines the sound absorbing performance and the heat insulating performance of the molding material, it is possible to improve the sound absorbing and heat insulating performance by using fine fibers of 1 to 6 denier as matrix fibers.

In the present invention, the molding substrate is manufactured by laminating the nonwoven fabric and the web laminate, and a method of pressing under heating can be used. As an example of the preferred method, the nonwoven fabric prepared in a roll state in front of the hot air oven machine is heated and combined by passing through a hot air oven of 150 to 200 ° C. in a state of being disposed on one surface of the upper or lower portion of the web laminate, and then After surface cooling under pressure, there is a method of hot pressing using a hot press roller of 150 to 250 ° C. When passing through the oven, the surface portions of the double-layered binder fiber contained in the web laminate and the nonwoven fabric are heat-sealed by hot air generated in the heating oven and adhered to each other. After the heat fusion, the surface-cooled composite material becomes a secondary composite by the hot press roller surface temperature so that the web laminate and the nonwoven fabric are completely fused and the thickness of the final product is adjusted.

The reason why the cooling roller is used is to transfer the molding material that has passed through the hot oven directly to the hot press roller, so that the residual material remaining on the surface causes the molding material to stick to the roller. To cool. The temperature of the hot press roller is suitable at 150 ~ 250 ℃ in the secondary fabrication process, and the thickness of the laminated molding material can be adjusted to 20 ~ 50mm to make the molding smooth. The molding material thus produced is finally passed through a cooler, whereby the shape is maintained while maintaining a predetermined thickness and then cut to fit a predetermined dimension.

In the following examples, the non-woven fabric and the polyester binder fibers and the polyester matrix fibers constituting the web laminate are prepared by melting point and shape to provide a non-limiting example of manufacturing a molding material for an engine hood.

Example 1

A needle punching machine composed of three binder punching fibers was formed by forming a fibrous web by carding a raw material composed of a polyester binder fiber having a melting point of 120 ° C., 20 deg. Black dendritic fiber and 20 deg. By punching uniformly, the nonwoven fabric of thickness 2mm was prepared.

A web laminate was formed by laminating a fibrous web obtained by carding a raw material comprising a polyester binder fiber having a melting point of 170 ° C., 20 wt% of black dendritic fiber of 4 denier and 20 wt% of 1.5 denier black native fiber as matrix fiber. Ready.

The prepared nonwoven fabric is heated and blended by passing through a hot air oven of 150 to 200 ° C. in a state of being placed on the upper or lower portion of the web laminate, and then cooled by pressing with a cooling roller, and then cooled to a hot press roller of 150 to 250 ° C. Press roller) to obtain an engine hood molding material having a thickness of 35 mm.

The molded article was manufactured using the die for engine hood, and then the physical properties (absorption rate and heat resistance) and moldability after molding were measured and evaluated in the following manner.

* Absorption rate: Vertical incidence absorption rate using an in-tube tester, measured by collecting the volume of the molded product.

* Heat resistance: Measure the dimensions (thickness) before putting into the oven and the dimensions (thickness) after 3 hours at 110 ° C after adding to the rate of change. The higher the value, the poorer the heat resistance.

* Moldability: The moldability of the part by thickness and the overall molding state as compared to the drawing dimension after molding. (◎ good, △ normal, × poor).

* Strength: Flexural strength after molding, ◎ is good, △ is normal, and × is poor.

[Examples 2 to 5 and Comparative Examples 1 to 2]

The same procedure as in Example 1 was repeated except that the type and content of binder fibers and matrix fibers were changed as shown in Table 1.

Non-woven Web stack Binder fiber Matrix Fiber Binder fiber Matrix fiber Melting point Island content Island content Melting point Island content Island content Example 1 120 ℃ 4De ' 20% 6De ' 80% 170 ℃ 4De ' 20% 1.5De ' 80% Example 2 120 ℃ 4De ' 20% 6De ' 80% 170 ℃ 4De ' 40% 1.5De ' 60% Example 3 120 ℃ 4De ' 20% 6De ' 80% 170 ℃ 4De ' 20% 3De ' 80% Example 4 120 ℃ 4De ' 20% 6De ' 80% 170 ℃ 4De ' 40% 3De ' 60% Example 5 120 ℃ 4De ' 20% 6De ' 80% 170 ℃ 4De ' 20% 6De ' 80% Example 6 120 ℃ 4De ' 20% 6De ' 80% 170 ℃ 4De ' 40% 6De ' 60% Example 7 120 ℃ 4De ' 20% 6De ' 80% 200 ℃ 4De ' 20% 1.5De ' 80% Example 8 120 ℃ 4De ' 20% 6De ' 80% 200 ℃ 4De ' 40% 1.5De ' 60% Example 9 120 ℃ 4De ' 20% 6De ' 80% 200 ℃ 4De ' 20% 3De ' 80% Example 10 120 ℃ 4De ' 20% 6De ' 80% 200 ℃ 4De ' 40% 3De ' 60% Example 11 120 ℃ 4De ' 20% 6De ' 80% 200 ℃ 4De ' 20% 6De ' 80% Example 12 120 ℃ 4De ' 20% 6De ' 80% 200 ℃ 4De ' 40% 6De ' 60% Comparative Example 1 120 ℃ 4De ' 20% 6De ' 80% 120 ℃ 4De ' 20% 6De ' 80% Comparative Example 2 120 ℃ 4De ' 20% 6De ' 80% 120 ℃ 4De ' 40% 6De ' 60%

Physical properties of the molding substrate obtained in the above Examples and Comparative Examples are shown in Table 2.

Product characteristics after molding Sound absorption rate (NRC) 15T standard Heat resistance dimension change rate (%) burglar Formability Example 1 0.45 2.2 × × Example 2 0.38 4.3 △ △ Example 3 0.42 2.3 △ △ Example 4 0.32 3.8 ◎ ◎ Example 5 0.32 3.5 ◎ ◎ Example 6 0.31 4.5 ◎ ◎ Example 7 0.42 2.6 △ △ Example 8 0.36 1.2 ◎ ◎ Example 9 0.38 3.4 △ △ Example 10 0.32 2.1 ◎ ◎ Example 11 0.34 3.7 ◎ ◎ Example 12 0.32 2.5 ◎ ◎ Comparative Example 1 0.15 25.6 △ △ Comparative Example 2 0.17 24.3 ◎ ◎

As described above, according to the present invention, it is possible to manufacture a molding material which is very suitable for an engine hood by using a polyester plush with a simplified process, high productivity and low manufacturing cost, and improve heat resistance and sound absorption performance. In addition, it can be recycled using environmentally friendly materials, which can solve the environmental problems caused by waste and the lack of resources.

Claims (7)

In the engine hood molding material for automobiles, An engine hood molding material for automobiles, comprising a polyester web laminate and a nonwoven fabric laminated on one surface thereof, wherein the web laminate is composed of polyester binder fibers and polyester matrix fibers having a melting point of 170 to 200 ° C. . 2. The engine hood molding material for automobile according to claim 1, wherein the web laminate comprises 20 to 50 wt% of polyester binder fibers and 50 to 80 wt% of polyester matrix fibers. 2. The automobile engine hood molding material according to claim 1, wherein the fineness of the polyester binder fibers of the web laminate is 2 to 4 deniers and the fineness of the polyester matrix fibers is 1 to 6 deniers. 2. The engine hood molding material for automobile according to claim 1, wherein the thickness of the nonwoven fabric is 2 to 25% of the thickness of the molding material. In the method of manufacturing the engine hood molding material for automobiles, A process of manufacturing a web laminate by mixing and carding a polyester binder fiber and a polyester matrix fiber having a melting point of 170 to 200 ° C. to form a web, and laminating a nonwoven fabric on one surface of the web laminate, wherein the nonwoven fabric is A vehicle comprising the step of passing the laminated web laminate through a hot oven, and carrying out a first step of passing the hot rolled roller after passing the first laminated molding material through a cooling roller. Method for manufacturing an engine hood molding material. The method of manufacturing an engine hood molding base material for automobiles according to claim 5, wherein the temperature of the hot oven is 150 to 200 ° C. The method of manufacturing an engine hood molding material for an automobile according to claim 5, wherein the hot press roller has a temperature of 150 to 250 ° C.